Whoops. That was a typo. I meant 150.
you’d need LED efficiency of 180 lm/W or better
Indeed, and the XHP70.2 is around that mark at 5W. This test of an XHP70.2 P2 bin shows 964lm from 5.53W or 174 lm/W. P4 bins (7% higher) are available and should be about 187 lm/W at the same power level. The datasheet lists an even higher Q2 bin, but I’m not sure they actually exist.